It had been a busy week for the 1st and 7th Motor Transport Battalions, commanded respectively by Lieutenant Colonel Howard E. Wertman and Major Herbert E. Pierce. Two hundred Division trucks and a like number of U.S. Army vehicles made up the long columns that shuttled back and forth across the peninsula. The plan provided for moving an infantry regiment every third day. For the drivers this meant a 140-mile trip, a return trip the following day, and a one-day layover for maintenance before commencing the new cycle. The artillery battalions, by order of X Corps, were retained until the latest possible date. The statistics of Operation MIXMASTER are impressive. It took 5,716 truck loads and 80 DUKW loads to move most of the Division personnel, gear, and supplies. Sixty-three lowboys (flat-bed trailers) and 83 railroad cars were also utilized in addition to hundreds of jeeps and jeep trailers. Three LSDs and 11 LSTs sailed from Sokcho-ri to Inchon with the heaviest equipment. During the previous winter a sizable number of prefabricated shelters had been set up for supporting and headquarters units. Since timber, logs, and salvage materials were in short supply, the 1st Marine Division moved large quantities of these materials to the west coast in order to live as comfortably as possible under static warfare conditions. The operations of the 1st Marine Division in defense of the western sector of Line JAMESTOWN do not come within the scope of Volume IV. The account of Marine activities in the new sector, under the operational control of I Corps, will be discussed in the fifth and final volume of this series. _Operations of Fifteen Months in Retrospect_ During 1951 the Korean War became a most unpopular military venture among Americans. As a consequence, letters and newspapers from home caused a certain amount of anxiety among citizen-soldiers in Korea. To counter any spirit of doubt which may have arisen, military leaders issued frank and honest replies to inquiring politicians. The _esprit de corps_ of Marines was high, and they were well aware of their purpose in Korea. One noted author, on spending a couple of days among front-line Marines during January of 1952, told a group of officers at the Division CP that he “was impressed with the morale of the Marines on the MLR.” He stated that he “had been prepared to find that they didn’t know what they were fighting for or why they were there.” However, he was encouraged to find that they knew exactly their purpose in the Korean fighting.[374] [374] Col F. B. Nihart, Comments regarding author James Michener’s visit to 1stMarDiv, ltr of 23 Mar 59. The period of nearly 15 months covered by Volume IV was at that time the longest stretch of land warfare ever experienced by a major Marine unit. Even during the numerous island-hopping campaigns of World War II, the periods of combat were relatively brief for each.